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The Collaborative International Dictionary of English v.0.48:

Olefiant \O*le"fi*ant\, a. [F. ol['e]fiant, fr.L. oleum oil +
   -ficare (in comp.). Cf. -Fy.] (Chem.)
   Forming or producing an oil; specifically, designating a
   colorless gaseous hydrocarbon called ethylene (olefiant gas).
   [Archaic]
   [1913 Webster] olefin